399443718 has 8 divisors (see below), whose sum is σ = 798887448. Its totient is φ = 133147904.

The previous prime is 399443717. The next prime is 399443743. The reversal of 399443718 is 817344993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

399443718 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399443717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33286971 + ... + 33286982.

It is an arithmetic number, because the mean of its divisors is an integer number (99860931).

Almost surely, 2^399443718 is an apocalyptic number.

399443718 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399443718 is a wasteful number, since it uses less digits than its factorization.

399443718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66573958.

The product of its digits is 653184, while the sum is 48.

The square root of 399443718 is about 19986.0881114839. The cubic root of 399443718 is about 736.4645812008.

The spelling of 399443718 in words is "three hundred ninety-nine million, four hundred forty-three thousand, seven hundred eighteen".